/Engine/Plugins/Slate/SlateScripting/Source/SlateScriptingCommands/Public/UICommandsScriptingSubsystem.h
Registers a command within the given context and set. The set must be registered beforehand.
Whether the command was successfully registered
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Editor Scripting | Commands |") bool RegisterCommandChecked ( [FScriptingCommandInfo](API\Plugins\SlateScriptingCommands\FScriptingCommandInfo) CommandInfo, [FExecuteCommand](API\Plugins\SlateScriptingCommands\FExecuteCommand) OnExecuteCommand, [FCanExecuteCommand](API\Plugins\SlateScriptingCommands\FCanExecuteCommand) OnCanExecuteCommand, bool bOverrideExisting )